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<TITLE>[Chapter 23] 23.4 java.beans.Customizer (JDK 1.1)</TITLE>
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<h2 CLASS=sect1><A CLASS="TITLE" NAME="JNUT2-CH-23-SECT-4">23.4 java.beans.Customizer (JDK 1.1)</A></h2>

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<P CLASS=para>
The <tt CLASS=literal>Customizer</tt> interface specifies the methods that
must be defined by any class designed to customize a Java
bean.  In addition to implementing this interface,
a customizer class must be a subclass of
<tt CLASS=literal>java.awt.Component</tt>, and it must have a constructor
that takes no arguments, so that it can be instantiated by
an application builder.

<P CLASS=para>
Customizer classes are typically used by a complex Java bean
to allow the user to easily configure the bean, and to provide
an alternative to a simple list of properties and their
values.  If a customizer class is defined for a Java bean,
it must be associated with the bean through a
<tt CLASS=literal>BeanDescriptor</tt> object returned by a <tt CLASS=literal>BeanInfo</tt>
class for the bean.  Note that while a <tt CLASS=literal>Customizer</tt>
class is created by the author of a bean, that class is only
instantiated and used by application builders and similar
tools. 

<P CLASS=para>
After a <tt CLASS=literal>Customizer</tt> class is instantiated, its
<tt CLASS=literal>setObject()</tt> method is invoked once to specify
the bean object that it is to customize.  The
<tt CLASS=literal>addPropertyChangeListener()</tt> and
<tt CLASS=literal>removePropertyChangeListener()</tt> methods may be called
to register and de-register <tt CLASS=literal>PropertyChangeListener</tt> objects.
The <tt CLASS=literal>Customizer</tt> should send a
<tt CLASS=literal>PropertyChangeEvent</tt> to all registered listeners any
time it changes a property of the bean it is customizing.

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<PRE>
public abstract interface <tt CLASS=literal>Customizer</tt> {
    // <tt CLASS=literal>Public Instance Methods</tt>
            public abstract void <tt CLASS=literal>addPropertyChangeListener</tt>(PropertyChangeListener <tt CLASS=literal>listener</tt>);
            public abstract void <tt CLASS=literal>removePropertyChangeListener</tt>(PropertyChangeListener <tt CLASS=literal>listener</tt>);
            public abstract void <tt CLASS=literal>setObject</tt>(Object <tt CLASS=literal>bean</tt>);
}
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